Stand With Science: What the Evidence Says About Your Workplace

Every year on 7 April, the World Health Organization marks World Health Day with a theme. This year's theme is "Together for health. Stand with science." The WHO's call is clear: good health decisions are built on evidence, not habit, assumption, or the path of least resistance.

For most adults, work accounts for roughly a third of their waking hours. The conditions of that work, whether supportive or harmful, have a direct and measurable effect on physical and mental health. Yet in workplaces across the UK, decisions that affect employee wellbeing are still too often made without reference to the evidence that now exists.

World Health Day 2026 is a useful moment for employers and HR professionals to ask a direct question: is your approach to workplace health built on evidence, or convenience?

The Numbers Are Not Improving

The Health and Safety Executive published its annual statistics for 2024/25 in November 2025. The figures should concern any employer who is paying attention.

An estimated 1.9 million workers suffered from work-related ill health during the year, continuing to exceed pre-pandemic levels.¹

Mental health conditions remain the dominant driver. In 2024/25, 964,000 workers reported stress, depression or anxiety caused or made worse by their work. That is roughly one in every 30 workers in Britain. Work-related ill health and injuries resulted in an estimated 40.1 million working days lost. The estimated annual cost of workplace injuries and new ill-health cases stands at £22.9 billion.

These aren't abstract statistics. They represent people who are unwell because of where and how they work. They represent managers dealing with absence, teams absorbing additional workload, and organisations losing capability they cannot easily replace.

The science on what drives these outcomes isn't new, and it's not ambiguous. Workload, job control, workplace relationships, role clarity, and management quality are all established determinants of employee health. The HSE's own Management Standards framework codifies this evidence. The question is whether employers are applying it.

For employers, these are not wellbeing concerns that can be addressed when budgets allow. They are legal, operational, and financial risks. The distinction matters.

For employers, workplace health is not a wellbeing issue. It is a legal, operational, and financial risk.

What "Standing With Science" Looks Like in Practice

The WHO's theme is not a call to read academic journals. It is a call to make decisions based on what the evidence actually shows, rather than what's comfortable to believe.

In a workplace context, that means several things.

Risk assessment must include psychological hazards

Under the Health and Safety at Work etc. Act 1974 and the Management of Health and Safety at Work Regulations 1999, employers have a legal duty to assess and control risks to the health of their employees. That duty applies to psychological risks as well as physical ones.

The HSE's Management Standards identify six key areas of work design that, if poorly managed, are associated with poor health: demands, control, support, relationships, role, and change.²

These are not aspirational guidelines. Far from it. They represent the evidence base for what actually causes harm.

Employers who conduct risk assessments focused solely on manual handling, fire, and chemical hazards, but who have never systematically assessed psychosocial risks, are not meeting their duty of care. More to the point, they are leaving a significant and growing source of harm unaddressed.

Early intervention is substantially more effective than late intervention

The evidence on absence management is consistent: the longer a person is absent from work due to a health condition, the harder it becomes to return.³

After four to six weeks of absence, the probability of a successful return to work begins to decline markedly. After six months, it has fallen significantly. After a year, most people do not return to the same employer.

Early, supportive contact between managers and absent employees, combined with phased return plans and reasonable workplace adjustments, is one of the most evidence-backed interventions available to employers. It is also, in most cases, one of the lowest-cost.

The barrier is rarely knowledge. It is usually discomfort: managers who are unsure what to say, or who worry they will make the situation worse. This is precisely where training matters.

The barrier is rarely knowledge. It is usually discomfort.

Mental health first aid is a trained skill, not a personality trait

It is still common for organisations to assume that supporting employee mental health is the domain of naturally empathetic managers, or of a wellbeing programme built around fruit bowls and wellness apps. The science doesn't support this approach.

Mental health first aid, like physical first aid, is a learnable set of skills. It equips designated individuals to recognise the early signs of mental ill health, to have appropriate initial conversations, and to guide colleagues towards professional support. It does not replace clinical care, but it closes the gap between someone struggling and someone getting help.

There is good evidence that trained workplace mental health first aiders improve the likelihood of early help-seeking and reduce stigma around mental health in organisational settings.⁴

This is not a nice-to-have. In an environment where stress, anxiety and depression account for more than half of all work-related ill health, it is a direct response to a documented operational risk.

The Presenteeism Problem

Absence figures capture only part of the picture. Presenteeism, where employees are at work but operating below full capacity due to health problems, is estimated to cost UK employers more than absenteeism.

Research consistently shows that untreated mental health conditions in particular lead to significant reductions in productivity while the individual remains nominally at work.⁵

An employee managing significant anxiety or depression while continuing to attend work is not an organisational success. They are a person in distress, and the output cost to the organisation, whilst harder to measure than absence, is real. In many organisations, it exceeds the cost of absence.

A workplace health strategy built on the evidence needs to account for both. It needs to create conditions in which people can raise concerns early, access support without stigma, and, where necessary, take the time they need to recover before their health deteriorates further.

What Employers Can Do

The evidence on what works is not disputed. What is less common is organisations applying it consistently, rather than reactively. The following are not novel interventions: they are established actions that the evidence supports and that many employers have yet to implement systematically.

• Conduct a psychosocial risk assessment using the HSE Management Standards as a framework. If you have not done this before, the HSE website provides free tools and guidance.
• Train managers in early intervention: how to have supportive conversations with employees who may be struggling, and how to facilitate a return to work after absence.
• Invest in workplace mental health first aid training. Ensuring that trained individuals are accessible across your workforce is a proportionate and evidence-based response to the scale of the problem.
• Review your sickness absence policy. Policies that focus on trigger points and disciplinary processes, rather than on support and early intervention, are not consistent with the evidence on effective absence management.
• Create the conditions for early disclosure. If employees do not feel safe raising health concerns early, problems escalate. Psychological safety is not a cultural luxury; it is operationally significant.

How Constellation Training Can Help

At Constellation Training, our workplace mental health first aid qualifications are delivered under Nuco's Ofqual-regulated First Aid for Mental Health framework, at Levels 1, 2, and 3. These are not awareness sessions. They are structured, evidence-based qualifications that give your designated workplace mental health first aiders a recognised and defensible foundation.

We also deliver personal development training that supports managers in having difficult conversations, building psychological safety within their teams, and developing the practical leadership skills that underpin a healthy working environment.

Workplace health is not a wellbeing initiative. It is a risk management responsibility.

If you need to align training with that responsibility, we will help you structure the approach.

Find out more about our mental health first aid qualifications or get in touch directly to discuss your organisation's needs.

References and Further Reading

^1. Health and Safety Executive. Health and safety at work: Summary statistics for Great Britain 2025. HSE, November 2025. hse.gov.uk/statistics

^2. Health and Safety Executive. Work-related stress, anxiety or depression and the Management Standards. hse.gov.uk/stress/standards

^3. Waddell G, Burton AK. Is Work Good for Your Health and Well-Being? TSO, 2006. Widely cited in Department for Work and Pensions vocational rehabilitation policy.

^4. Kitchener B, Jorm AF. Mental health first aid training in a workplace setting. BMC Psychiatry 2004; 4:23. See also subsequent meta-analyses of workplace MHFA outcomes.

^5. Centre for Mental Health. Mental health at work: The business costs ten years on. Centre for Mental Health, 2017. centreformentalhealth.org.uk

^6. World Health Organization. World Health Day 2026: Together for health. Stand with science. who.int/campaigns/world-health-day/2026

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Constellation Training | FAIB-accredited first aid qualifications | Nuco-accredited mental health first aid qualifications